Global CO2 emissions have increased greatly in the last few hundred years and are strongly correlated to human industrial advances.

We know that CO2 is a by-product of the use of fossil fuels. Fossil fuels dominate our energy production.

CO2 has the effect of trapping radiative energy from the Sun, which gets reflected back to the surface of the planet.

The global mean temperatures are in a rising trend when observational data is analyzed.

Since CO2 is created through human activity, it can be concluded that human activity is at least a partial cause of global warming.

What weaknesses exist in the premises that lead to the conclusion?

CO2 is not the leading greenhouse emission. In fact it plays a relatively small role. Historically CO2 increases follow an increase in temperature, as a greater number of living creatures tends to increase the CO2 levels.

Water vapor is far more effective at trapping radiative heat.

Global mean temp has historically been higher without man's assistance. In fact when it was at it's highest temps the Earth was going through an explosive growth of life.

Correlation does not imply causality. And actually, we are pumping less pollutants into the atmosphere than in many phases of our civilization.

Many of the models of global warming tend to ignore external causes. For example volcanic activity, which pumps as much CO2 into the air as every car running constantly for a year, Solar activity, which has already shown that it has a more dramatic effect on our temperatures.

And the biggest problem with warming is that it makes money. You don't debunk what gets you the grants.

"I would rather be exposed to the inconveniences attending too much liberty than to those attending too small a degree of it." Thomas Jefferson